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Related Experiment Videos

Persistent secondary hyperparathyroidism after renal transplantation

P Messa1, C Sindici, G Cannella

  • 1Nephrology, Dialysis and Transplantation Unit, Tissue Typing Laboratory, Ospedale S. Maria della, Martino, Genova, Italy. pmessa@spin.it

Kidney International
|December 9, 1998
PubMed
Summary

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Secondary hyperparathyroidism often persists after kidney transplants. The study found that pre-existing condition severity and vitamin D receptor (VDR) genotype influence parathyroid hormone (PTH) levels post-transplant.

Area of Science:

  • Nephrology
  • Endocrinology
  • Genetics

Background:

  • Secondary hyperparathyroidism is common post-renal transplant, often causing hypercalcemia.
  • Vitamin D receptor (VDR) genotypes may affect parathyroid hormone (PTH) secretion in hyperparathyroidism.
  • Understanding these factors is crucial for managing post-transplant complications.

Purpose of the Study:

  • To determine if persistent secondary hyperparathyroidism after renal transplantation involves altered calcium-controlled PTH secretion.
  • To investigate the potential role of different VDR allelic distributions in this setting.

Main Methods:

  • Eighty-one renal transplant recipients were monitored for PTH, metabolic variables, and VDR B/b alleles (BsmI).
  • Detailed analysis of Ca-PTH kinetics, bone density, calcitriol, PTH-related peptide, and urinary hydroxyproline was performed in 22 patients.

Related Experiment Videos

  • Patients were grouped based on stabilized PTH levels at three months post-transplant.

    • Main Results:

    • Patients with higher persistent PTH levels (Group B) were older, had longer dialysis times, and higher pre-transplant PTH.
    • Group B exhibited increased maximal, minimal, and set-point PTH levels compared to Group A.
    • The VDR BB genotype was associated with the lowest PTH levels and lower set-point values.

    Conclusions:

    • The severity of pre-transplant secondary hyperparathyroidism is a key predictor of its persistence.
    • Persistent secondary hyperparathyroidism after transplantation shows an autonomous PTH secretion pattern.
    • The VDR BB genotype appears linked to reduced PTH levels post-transplantation.